* METHOD Adaptation of the Standard Methods for the Examination of Water and Wastewater, 20th edition, Ascorbic Acid method. The reaction between phosphate and the reagent causes a blue tint in the sample.

* ENVIRONMENT 0 to 50Â°C (32 to 122 Â°F)

* max. 95% RH non-condensing

* BATTERY TYPE 1 x 1.5V AAA

* AUTO-SHUT OFF After 3 minutes of non-use and 2 minutes after reading